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3 years ago

What is extraction of metals?

1 answer:

5 0

Extracting is cleaning and reducing the metals AKA removing the oxygen (O) from the metal, to then bind with carbon (C) (with iron at least)

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Please help ! its urgent!!

ArbitrLikvidat [17]

Answer:

Explanation:

Respiration is the process by which you get energy from food. So energy in food is converted to a form that can be used by the body

5 0

3 years ago

What is the major driving force for losing a proton as the last step in an electrophilic aromatic substitution reaction?

Fofino [41]

Answer:

Explanation:

In the following reaction we have shown an example of aromatic substitution reaction .

C₆H₆ + RCl = C₆H₅R + HCl

This reaction takes place in the presence of catalyst like AlCl₃ which is a lewis acid .

First of all formation of carbocation is made as follows .

RCl + AlCl₃ = R⁺ + AlCl₄⁻

This R⁺ is carbocation which is also called electrophile . It attacks the ring to get attached with it .

C₆H₆ + R⁺ = C₆H₅R⁺H.

The complex formed is unstable , though it is stabilized by resonance effect . In the last step H⁺ is kicked out of the ring . The driving force that does it is the steric hindrance due to presence of two adjacent group of H and R⁺ at the same place . Second driving force is attack by the base AlCl₄⁻ that had been formed earlier . It acts as base and it extracts proton ( H⁺ ) from the ring .

C₆H₅R⁺H + AlCl₄⁻ = C₆H₆ + AlCl₃ + HCl .

The formation of a stable product C₆H₆ also drives the reaction to form this product .

4 0

3 years ago

When magnesium burns in air, it combines with oxygen to form magnesium oxide according to the following equation. What mass in g

Kisachek [45]

Answer: The given quantity is 2 moles of magnesium or 48 g of magnesium.

The unknown quantity is mass of MgO in grams.

Molar mass of MgO = 40 g

Explanation: $2Mg+O_2\rightarrow 2MgO$

As can be seen from the chemical equation, 2 moles of magnesium react with 1 mole of oxygen gas to give 2 moles of MgO.

According to mole concept, 1 mole of every substance weighs equal to its molar mass.

Thus $2\times 24= 48 g$ of magnesium produce= $2\times 40= 80 g$ of MgO.

Molar mass is the mass in grams of 1 mole of the substance.

Thus if 2 moles of MgO weigh= 80 g

1 mole of MgO will weigh= $\frac{80}{2}\times 1 =40g$

Thus molar mass of MgO is 40 g.

6 0

3 years ago

The ph of a 0. 102 m solution of a weak acid (ha) is 1. 15 ka for the weak acid is?

Advocard [28]

The pH of the weak acid is 6.93.

Given,

K= 1.15 * $10^{-6}$

c=0.102

[H]= K*c= 1.15 * $10^{-6}$ * 0.102= 0.1173 * $10^{-6}$

p[H]= -log[H]= 6.93

A weak acid is one that partially separates into its ions in water or an aqueous solution. A strong acid, on the other hand, completely splits into its ions in water. The conjugate base of a weak acid is also a weak base, and vice versa for the conjugate acid of a weak base. Weak acids have a higher pH than strong acids at the same concentration. Simple arrows pointing left to right are used to represent the reaction of a strong acid ionising in water. On the other hand, a weak acid ionising in water has a double arrow reaction arrow, indicating that both the forward and reverse reactions take place at equilibrium.

Learn more about Weak acid here:

brainly.com/question/22104949

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6 0

1 year ago

Question 9(Multiple Choice Worth 1 points)

sergiy2304 [10]

Main sequence starts maybe

6 0

4 years ago

Read 2 more answers